Enter your sale details
Select your state to auto-fill the base rate, or enter a custom rate if you know your combined rate.
Base state rate: 6.00%
Philadelphia adds 2% local tax (total 8%)
Sales Tax Calculator
Calculate the exact sales tax for any transaction — by state, local rate, or custom rate. See the full breakdown in seconds.
Why use this calculator?
Sales tax sounds simple until you realize rates vary by state, county, and even city — and mischarging customers is both a compliance risk and a reputation problem. This calculator gives you the correct amount for any transaction, anywhere in the US.
More importantly, sales tax collected is not your money. It belongs to the state and must be remitted on a regular schedule. Tracking it accurately in your books is not optional — and a bookkeeper makes sure it never becomes a problem.
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How does sales tax work for small businesses?
What is sales tax?
Sales tax is a consumption tax collected by businesses at the point of sale and remitted to the state government. Rates vary by state, county, and city — Pennsylvania's base rate is 6%, but Philadelphia adds a 2% local rate, making the combined rate 8% for most goods and services sold in the city.
Do I have to collect sales tax?
If you sell taxable goods or services in a state where you have nexus (a physical or economic presence), you're required to collect and remit sales tax. Every state has different rules for what creates nexus and which products are taxable. Getting this wrong exposes your business to back taxes, penalties, and interest.
What is sales tax nexus?
Nexus is the connection between your business and a state that creates a tax obligation. Physical nexus includes having an office, employee, or inventory in a state. Economic nexus — triggered by most states after the 2018 South Dakota v. Wayfair ruling — applies when you exceed a certain sales threshold in a state, even with no physical presence.
How often do I remit sales tax?
Filing frequency depends on your sales volume and the state. High-volume sellers may file monthly. Smaller businesses often file quarterly or annually. Missing a remittance deadline triggers penalties and interest. A bookkeeper tracks your collected sales tax separately so you always know exactly what you owe and when.
Is sales tax the same everywhere in Pennsylvania?
No. Pennsylvania's base rate is 6%, but Philadelphia adds a 2% local sales tax (8% total) and Allegheny County adds 1% (7% total). If you sell to customers in multiple jurisdictions, you need to apply the correct rate for each location — which is exactly why automated bookkeeping and tools like this calculator matter.
What happens if I don't collect sales tax?
If you're required to collect sales tax and don't, you're still liable for the tax — plus penalties and interest. States can audit businesses and assess back taxes for uncollected amounts. This is one of the most common and costly bookkeeping mistakes for small businesses, and it's entirely preventable with proper records.